I am planning to brush up my Chinese on the internet. Does anybody know a good Chinese go-site, chat-forum or both that would fit the purpose?

围棋 forums:

http://bbs.eweiqi.com/
(eweiqi is tygem)

http://club.weiqi.tom.com/forum_111_0_0_0_0.html
(TOM weiqi forum)

http://forum.sports.sina.com.cn/forum-40-1.html
(Sina weiqi forum, I sina has a weiqi client and community but I don't know if it connects to their server or something like tygem)

http://bbs.bywq.com/
http://www.weiqibar.com/forum.php
Powered by the same bbs software, but different websites. Interesting info in both forums.

http://www.gochess.cn/forum-11-1.html
Also a mine of useful stuff if you know how to dig...

http://www.flygo.net/bbs/
I don't find the forum very active/up-to-date BUT I advise you to go to the index page:
http://www.flygo.net/index1.html
and click on each blue link on the left menu. LOTS of useful stuff there. (although the most recent news is from last year, you will find a lot of invaluable resources)

There are also some stuff on baidu's weiqi bar:
http://tieba.baidu.com/f?kw=%CE%A7%C6%E5

Happy diggin'

Thanks a lot, Sefo and TegaiS, for the quick response!